Communication system, mobile station device, and communication method

ABSTRACT

A mobile station device includes an information acquisition unit that is configured to and/or programmed to acquire information, which specifies a system bandwidth and a carrier frequency of a second downlink carrier component different from a first downlink carrier component, transmitted using RRC signaling via a physical downlink shared channel within the first downlink carrier component and a communication unit that is configured to communicate with the base station device by aggregate use of both the first downlink carrier component and the second downlink carrier component, where the first downlink carrier component and the second downlink carrier component have different carrier frequencies and each of the first downlink carrier component and the second downlink carrier component has its own downlink system bandwidth.

This application is continuation of application Ser. No. 13/057,263,filed on Feb. 2, 2011, which is the national phase of PCT InternationalApplication No. PCT/JP2009/003757 filed Aug. 5, 2009, which claimsbenefit of priority JP 2008-203361 filed Aug. 6, 2008. The entirecontents of each of the above-identified applications are herebyincorporated by reference.

TECHNICAL FIELD

The present invention relates to a communication system, a mobilestation device, and a communication method.

BACKGROUND ART

Third Generation Partnership Project (3GPP) is a project in whichspecifications of mobile phone systems are studied and created. 3GPP isbased on an evolved network of wideband code division multiple access(W-CDMA) and a global system for mobile communications (GSM).

In 3GPP, a W-CDMA scheme has been standardized as a 3^(rd) generationcellular mobile communication scheme and its services have beensequentially initiated. Also, high-speed downlink packet access (HSDPA)having a higher communication rate has been standardized and itsservices have been initiated.

In 3 GPP, evolved universal terrestrial radio access (EUTRA), which isthe evolution of 3G radio access technology, has been studied.

In EUTRA, an orthogonal frequency division multiple access (OFDMA)scheme has been proposed as a downlink communication scheme. OFDMA is ascheme of performing multiplexing of users by subcarriers orthogonal toeach other.

In the OFDMA scheme, a technique called an adaptive modulation andcoding scheme (AMCS) based on adaptive radio link control (linkadaptation) of channel coding or the like is applied.

The AMCS is a scheme of switching radio transmission parameters (alsoreferred to as AMC modes) of an error correction scheme, a coding rateof error correction, a data modulation multinary number, and the like inresponse to channel qualities of mobile station devices so as toefficiently perform high-speed packet data transmission.

The channel qualities of the mobile station devices are fed back to abase station device with use of a channel quality indicator (CQI).

FIG. 19 is a diagram illustrating a channel configuration used in aradio communication system of the related art. This channelconfiguration is used in a radio communication system such as the EUTRA(see Non-Patent Document 1). The radio communication system shown inFIG. 19 includes a base station device 1000 and mobile station devices2000 a, 2000 b, and 2000 c. R01 denotes a range where the base stationdevice 1000 is communicable. The base station device 1000 communicateswith a mobile station device, which exists in the range R01.

In EUTRA, a physical broadcast channel (PBCH), a physical downlinkcontrol channel (PDCCH), a physical downlink shared channel (PDSCH), aphysical multicast channel (PMCH), a physical control format indicatorchannel (PCFICH), and a physical hybrid automatic repeat request (ARQ)indicator channel (PHICH) are used in a downlink through which a signalis transmitted from the base station device 1000 to the mobile stationdevices 2000 a to 2000 c.

In EUTRA, a physical uplink shared channel (PUSCH), a physical uplinkcontrol channel (PUCCH), and a physical random access channel (PRACH)are used in an uplink through which signals are transmitted from themobile station devices 2000 a to 2000 c to the base station device 1000.

FIG. 20 is a diagram showing an example of a band used in the radiocommunication system of the related art. In FIG. 20, the horizontal axisrepresents a frequency and the vertical axis represents a carrierfrequency. In FIG. 20, the carrier frequency is f11. The base stationdevice and the mobile station device perform communication using onecontinuous band W11 in a frequency axis. A method using theabove-described band is used in the general radio communication systemsuch as EUTRA.

FIG. 21 is a diagram showing another example of bands used in the radiocommunication system of the related art. In FIG. 21, the horizontal axisrepresents a frequency. In FIG. 21, the base station device and themobile station device perform communication using a plurality ofdiscontinuous bands W21 and W22 in the frequency axis. As shown in FIG.21, aggregation is referred to as a composite use of a plurality ofdiscontinuous bands in the frequency axis.

However, if the base station device and the mobile station deviceperform communication using a plurality of discontinuous frequency bandsas shown in FIG. 21 in the radio communication system known in therelated art, the mobile station device needs to specify a plurality offrequency bands by communicating with the base station device. Thus,there is a problem in that communication may not be rapidly initiatedsince information to be transmitted from the base station device to themobile station device increases at the initiation of communication.

-   Non-Patent Document 1: 3GPP TS (Technical Specification) 36.300,    V8.4.0 (2008-03), Technical Specification Group Radio Access    Network, Evolved Universal Terrestrial Radio Access (E-UTRA) and    Evolved Universal Terrestrial Radio Access Network (E-UTRAN);    Overall description; Stage 2 (Release 8)

DISCLOSURE OF INVENTION Problem to be Solved by the Invention

The present invention has been made in view of the above-describedcircumstances, and an object of the invention is to provide acommunication system, a mobile station device, and a communicationmethod that can reduce information to be transmitted from a base stationdevice to the mobile station device at the initiation of communicationand that can rapidly initiate communication.

Means for Solving the Problem

(1) The present invention has been made to solve the above-describedproblems. According to an aspect of the present invention, there isprovided a communication system including a base station device and amobile station device, wherein the base station device includes: asignal transmission unit which transmits a signal including information,which specifies at least one second frequency band different from afirst frequency band, to the mobile station device with use of RRCsignaling via a physical downlink shared channel within the firstfrequency band, and the mobile station device includes: an informationacquisition unit which acquires the information, which specifies the atleast one second frequency band different from the first frequency band,to be transmitted using the RRC signaling via the physical downlinkshared channel within the first frequency band; a frequency bandspecification unit which specifies the second frequency band based onthe information acquired by the information acquisition unit; and acommunication unit which communicates with the base station device withuse of the first frequency band or the second frequency band.

(2) According to another aspect of the present invention, there isprovided a mobile station device which communicates with a base stationdevice, the mobile station device including: an information acquisitionunit which acquires information, which specifies at least one secondfrequency band different from a first frequency band, transmitted usingRRC signaling via a physical downlink shared channel within the firstfrequency band; a frequency band specification unit which specifies thesecond frequency band based on the information acquired by theinformation acquisition unit; and a communication unit whichcommunicates with the base station device with use of the firstfrequency band or the second frequency band.

(3) In the mobile station device according to the aspect of the presentinvention, the frequency band specification unit may specify whether ornot to include a specific physical channel located within the secondfrequency band based on the information acquired by the informationacquisition unit.

(4) In the mobile station device according to the aspect of the presentinvention, a common control channel may be used as a logical channel,which carries the RRC signaling.

(5) In the mobile station device according to the aspect of the presentinvention, a dedicated control channel may be used as a logical channel,which carries the RRC signaling.

(6) According to still another aspect of the present invention, there isprovided a communication method using a base station device and a mobilestation device, the communication method including: transmitting, by thebase station device, a signal including information, which specifies atleast one second frequency band different from a first frequency band,to the mobile station device with use of RRC signaling via a physicaldownlink shared channel within the first frequency band, acquiring, bythe mobile station device, the information, which specifies the at leastone second frequency band different from the first frequency band, to betransmitted using the RRC signaling via the physical downlink sharedchannel within the first frequency band; specifying, by the mobilestation device, the second frequency band based on the informationacquired in the acquisition; and communicating, by the mobile stationdevice, with the base station device with use of the first frequencyband or the second frequency band.

Effect of the Invention

A communication system, a mobile station device, and a communicationmethod of the present invention can reduce information to be transmittedfrom a base station device to the mobile station device at theinitiation of communication and can rapidly initiate communication.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram showing a method of arranging physical resourceblocks (PRBs) according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a downlink channel configuration used in acommunication system according to the first embodiment of the presentinvention.

FIG. 3 is a diagram showing an uplink channel configuration used in acommunication system according to the first embodiment of the presentinvention.

FIG. 4 is a diagram showing a frame structure used in a downlink of aradio communication system according to the first embodiment of thepresent invention.

FIG. 5 is a diagram showing a frame structure used in an uplink of theradio communication system according to the first embodiment of thepresent invention.

FIG. 6 is a schematic block diagram showing a configuration of a basestation device 100 according to the first embodiment of the presentinvention.

FIG. 7 is a schematic block diagram showing a configuration of a mobilestation device 200 according to the first embodiment of the presentinvention.

FIG. 8 is a schematic block diagram showing configurations of a datacontrol unit 101 a, an OFDM modulation unit 102 a, and a radio unit 103a of the base station device 100 (FIG. 6) according to the firstembodiment of the present invention.

FIG. 9 is a diagram showing an example of a signal to be transmittedfrom the base station device 100 to the mobile station device 200according to the first embodiment of the present invention.

FIG. 10 is a schematic block diagram showing configurations of a radiounit 203 a, a channel estimation unit 205 a, an OFDM demodulation unit206 a, and a data extraction unit 207 a of the mobile station device 200(FIG. 7) according to the first embodiment of the present invention.

FIG. 11 is a diagram showing an example of bands used in the radiocommunication system according to the first embodiment of the presentinvention.

FIG. 12 is a schematic block diagram showing configurations of a datacontrol unit 101 b, an OFDM modulation unit 102 b, and a radio unit 103b of the base station device according to a modified example of thefirst embodiment of the present invention.

FIG. 13 is a schematic block diagram showing configurations of a radiounit 203 b, a channel estimation unit 205 b, an OFDM demodulation unit206 b, and a data extraction unit 207 b of the mobile station deviceaccording to a modified example of the first embodiment of the presentinvention.

FIG. 14 is a sequence diagram and the like showing processing of theradio communication system according to the first embodiment of thepresent invention.

FIG. 15 is a diagram showing an example of a system band configurationused in the first embodiment of the present invention.

FIG. 16 is a diagram showing another example of a system bandconfiguration used in the first embodiment of the present invention.

FIG. 17 is a sequence diagram showing processing of a radiocommunication system according to a second embodiment of the presentinvention.

FIG. 18 is a sequence diagram showing processing of a radiocommunication system according to a third embodiment of the presentinvention.

FIG. 19 is a diagram illustrating a channel configuration used in aradio communication system of the related art.

FIG. 20 is a diagram showing an example of a band used in a radiocommunication system of the related art.

FIG. 21 is a diagram showing another example of bands used in a radiocommunication system of the related art.

BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment

First, the first embodiment of the present invention will be described.According to the first embodiment of the present invention, a radiocommunication system includes one or more base station devices and oneor more mobile station devices, and radio communication is performedtherebetween. One base station device constitutes one or more cells. Oneor more mobile station devices can be accommodated in one cell.

FIGS. 1( a) and 1(b) are diagrams showing a method of arranging PRBs ofa downlink according to the first embodiment of the present invention.Here, a broadband system using a plurality of discontinuous system bands(occupancy bands) will be described. An example of a method of arrangingPRBs, which are allocation units of a user, will be also described. InFIG. 1( a), the vertical axis represents a frequency. In FIG. 1( b), thehorizontal axis represents a time and the vertical axis represents afrequency.

As shown in FIG. 1( a), a plurality of system bands (here, system bandsW1 and W2) are used when the base station device and the mobile stationdevice perform communication in the first embodiment of the presentinvention. A plurality of subcarriers are included in each of the systemband W1 and the system band W2.

FIG. 1( b) shows an example of a configuration of a subframe (subframe#F0 whose subframe number is 0), which is a transmission unit inorthogonal frequency division multiple (OFDM) that is a type ofmulticarrier communication scheme.

One subframe includes at least one slot. Here, for example, subframe #F0includes two slots #S0 and #S1.

The slot includes at least one OFDM symbol. Here, one slot #S0 or #S1includes 7 OFDM symbols.

One slot is divided into a plurality of blocks in a frequency axis. Apredetermined number of subcarriers constitute one PRB as a unit in thefrequency axis.

A unit constituted by one subcarrier and one OFDM symbol is referred toas a resource element. A modulation symbol or the like is mapped to eachresource element by resource mapping processing in a physical layer.

As described above, the PRBs are regions into which a subframe, which isa transmission unit, is divided in a grid pattern on two dimensions ofthe frequency and the time. Hereinafter, the case where each PRB has auniform bandwidth W_(PRB) in the frequency axis will be described. Asshown in FIG. 1( b), a downlink reference signal A01 or a physicaldownlink channel A02 is arranged in the PRB.

When one broadband system is operated by compositely using a pluralityof discontinuous bands W1 and W2 shown in FIG. 1( a), a natural numberof PRBs are arranged in each of the plurality of bands W1 and W2 on thefrequency axis in the first embodiment of the present invention. FIGS.1( a) and 1(b) show the case where the system uses two downlink bands ofthe system band W1 and the system band W2. N₁ (N₁ is a natural number)PRBs are arranged in the system band W1, and N₂ (N₂ is a natural number)PRBs are arranged in the system band W2.

For example, the bandwidth of one of the two system bands allowed forthe system is W1 and the bandwidth of the other system band is W2. In asystem in which a PRB bandwidth W_(PRB) is set to a fixed value, N1 isset to a natural number that is less than or equal to (W₁/W_(PRB)), andN2 is set to a natural number that is less than or equal to(W₂/W_(PRB)). Thereby, the system bands are used so that N₁ PRBs arearranged in a band of N₁W_(R P B) within the W1 band and N₂ PRBs arearranged in a band of N₂ W_(R P B) within the W2 band.

Alternatively, in a system in which a PRB bandwidth W_(PRB) is aparameter capable of being set for each base station device (or eachregion), which is a transmitter, W_(PRB) is set as W1/N₁ using apredetermined natural number N₁ or is set as W2/N₂ using a predeterminednatural number N₂. Here, W1 and W2 are use bandwidths considering guardbands.

FIG. 2 is a diagram showing a downlink channel configuration used in thecommunication system according to the first embodiment of the presentinvention. FIG. 3 is a diagram showing an uplink channel configurationused in the communication system according to the first embodiment ofthe present invention. Downlink channels shown in FIG. 2 and uplinkchannels shown in FIG. 3 respectively include logical channels,transport channels, and physical channels.

The logical channel defines a type of data transmission service to betransmitted/received to/from a medium access control (MAC) layer. Thetransport channel defines what is a characteristic of data to betransmitted by a radio interface and how data is transmitted. Thephysical channel is a physical channel that carries the transportchannel.

The logical channels of the downlink include a broadcast control channel(BCCH), a paging control channel (PCCH), a common control channel(CCCH), a dedicated control channel (DCCH), a dedicated traffic channel(DTCH), a multicast control channel (MCCH), and a multicast trafficchannel (MTCH).

The logical channels of the uplink include a CCCH, a DCCH, and a DTCH.

The transport channels of the downlink include a broadcast channel(BCH), a paging channel (PCH), a downlink shared channel (DL-SCH), and amulticast channel (MCH).

The transport channels of the uplink include an uplink shared channel(UL-SCH) and a random access channel (RACH).

The physical channels of the downlink include a PBCH, a PDCCH, a PDSCH,a PMCH, a PCFICH, and a PHICH.

The physical channels of the uplink include a PUSCH, a PRACH, and aPUCCH.

These channels are transmitted and received between the base stationdevice and the mobile station device as shown in FIG. 19 described inthe related art.

Next, the logical channels will be described. The BCCH is a downlinkchannel that is used to broadcast system control information. The PCCHis a downlink channel that is used to transmit paging information, andis used when a network does not know a cell position of the mobilestation device.

The CCCH is a channel that is used to transmit control informationbetween the mobile station device and the network, and is used by themobile station device that does not have a radio resource control (RRC)connection with the network.

The DCCH is a point-to-point two-way channel that is used to transmitindividual control information between the mobile station device and thenetwork. The DCCH is used by the mobile station device having the RRCconnection.

The DTCH is a point-to-point two-way channel, and is used fortransmission of user information (unicast data) in a dedicated channelof one mobile station device.

The MCCH is a downlink channel that is used for point-to-multipointtransmission of multimedia broadcast multicast service (MBMS) controlinformation from the network to the mobile station device. This is usedfor an MBMS service that provides a point-to-multipoint service.

MBMS service transmission methods include single-cellpoint-to-multipoint (SCPTM) transmission and multimedia broadcastmulticast service single frequency network (MBSFN) transmission.

The MBSFN transmission is a simultaneous transmission technique ofsimultaneously transmitting identifiable waveforms (signals) from aplurality of cells. On the other hand, the SCPTM transmission is amethod of transmitting the MBMS service by one base station device.

The MCCH is used in one or a plurality of MTCHs. The MTCH is a downlinkchannel that is used for point-to-multipoint transmission of trafficdata (MBMS transmission data) from the network to the mobile stationdevice.

The MCCH and the MTCH are used only by a mobile station device, whichreceives MBMS.

Next, the transport channels will be described. The BCH is broadcast tothe entire cell by a fixed and predefined transmission format. In theDL-SCH, hybrid automatic repeat request (HARQ), dynamic adaptive radiolink control, discontinuous reception (DRX), and MBMS transmission aresupported and need to be broadcast to the entire cell.

In the DL-SCH, beamforming is usable, and dynamic resource allocationand quasi-static resource allocation are supported. In the PCH, the DRXis supported and needs to be broadcast to the entire cell.

The PCH is mapped to a physical resource that is dynamically used for atraffic channel or another control channel, that is, the PDSCH.

The MCH needs to be broadcast to the entire cell. In the MCH, MBMSsingle frequency network (MBSFN) combining of MBMS transmissions from aplurality of cells, allocation of a quasi-static resource of a timeframe using an extended cyclic prefix (CP), or the like is supported.

In the UL-SCH, HARQ and dynamic adaptive radio link control aresupported. In the UL-SCH, beamforming is usable. Dynamic resourceallocation and quasi-static resource allocation are supported. In theRACH, limited control information is transmitted and a collision riskexists.

Next, the physical channels will be described. The PBCH is mapped to theBCH at an interval of 40 milliseconds. Blind detection of the timing of40 milliseconds is applied. That is, for timing presentation, explicitsignaling may not be performed. A subframe including the PBCH can bedecoded only by the subframe. That is, it is self-decodable.

The PDCCH is a channel that is used to notify a mobile station device ofPDSCH resource allocation, HARQ information for downlink data, anduplink transmission permission (uplink grant) in PUSCH resourceallocation.

The PDSCH is a channel that is used to transmit downlink data or paginginformation. The PMCH is a channel that is used to transmit the MCH. Adownlink reference signal, an uplink reference signal, and a physicaldownlink synchronization signal are separately arranged.

The PUSCH is a channel that is used to mainly transmit the UL-SCH. Whenthe base station device 100 schedules the mobile station device 200, achannel feedback report (a downlink channel quality indicator (CQI), aprecoding matrix indicator (PMI), or a rank indicator (RI)) or an HARQacknowledgement (ACK)/negative acknowledgement (NACK) to downlinktransmission is also transmitted using the PUSCH.

The PRACH is a channel that is used to transmit a random accesspreamble, and has a guard time. The PUCCH is a channel that is used totransmit the channel feedback report (CQI, PMI, and RI), a schedulingrequest (SR), an HARQ ACK/NACK to the downlink transmission, and thelike.

The PCFICH is a channel that is used to notify the mobile station deviceof the number of OFDM symbols used for the PDCCH, and is transmitted ineach subframe.

The PHICH is a channel that is used to transmit an HARQ ACK/NACK touplink transmission.

Next, channel mapping by the communication system according to the firstembodiment of the present invention will be described.

As shown in FIG. 2, mapping of the transport channel and the physicalchannel is performed in the downlink as follows. The BCH is mapped tothe PBCH.

The MCH is mapped to the PMCH. The PCH and the DL-SCH are mapped to thePDSCH.

The PDCCH, the PHICH, and the PCFICH are independently used as thephysical channels.

On the other hand, in the uplink, mapping of the transport channel andthe physical channel is performed as follows. The UL-SCH is mapped tothe PUSCH.

The RACH is mapped to the PRACH. The PUCCH is independently used as thephysical channel.

In the downlink, mapping of the logical channel and the transportchannel is performed as follows. The PCCH is mapped to the DL-SCH.

The BCCH is mapped to the BCH and the DL-SCH. The CCCH, the DCCH, andthe DTCH are mapped to the DL-SCH.

The MCCH is mapped to the DL-SCH and the MCH. The MTCH is mapped to theDL-SCH and the MCH.

Mapping from the MCCH and the MTCH to the MCH is performed upon MBSFNtransmission. On the other hand, this mapping is mapped to the DL-SCHupon SCPTM transmission.

On the other hand, in the uplink, mapping of the logical channel and thetransport channel is performed as follows. The CCCH, the DCCH, and theDTCH are mapped to the UL-SCH. The RACH is not mapped to the logicalchannel.

Next, a frame structure used in the radio communication system accordingto the first embodiment of the present invention will be described.

FIG. 4 is a diagram showing a frame structure used in the downlink ofthe radio communication system according to the first embodiment of thepresent invention. FIG. 5 is a diagram showing a frame structure used inthe uplink of the radio communication system according to the firstembodiment of the present invention. In FIGS. 4 and 5, the horizontalaxis represents a time and the vertical axis represents a frequency.

A radio frame to be identified by a system frame number (SFN) isconstituted by 10 milliseconds (10 ms). One subframe is constituted by 1millisecond (1 ms). The radio frame includes 10 subframes #F0 to #F09.

As shown in FIG. 4, a PCFICH A11, a PHICH A12, a PDCCH A13, a physicaldownlink synchronization signal A14, a PBCH A15, a PDSCH/PMCH A16, and adownlink reference signal A17 are arranged in the radio frame that isused in the downlink.

As shown in FIG. 5, a PRACH A21, a PUCCH A22, a PUSCH A23, an uplinkdemodulation reference signal A24, and an uplink measurement referencesignal A25 are arranged in the radio frame that is used in the uplink.

One subframe (for example, subframe #F0) is separated into two slots #S0and #S1. When a normal CP is used, a downlink slot includes 7 OFDMsymbols (see FIG. 4), and an uplink slot includes 7 singlecarrier-frequency division multiple access (SC-FDMA) symbols (see FIG.5).

If an extended CP (also referred to as a long CP) is used, the downlinkslot includes 6 OFDM symbols and the uplink slot includes 6 SC-FDMAsymbols.

One slot is divided into a plurality of blocks in the frequency axis.One PRB is constituted using twelve 15-kHz subcarriers as a unit in thefrequency axis. In response to a system bandwidth, 6 to 110 PRBs aresupported. FIGS. 4 and 5 show the case where the number of PRBs is 25.In the uplink and the downlink, different system bandwidths may be used.By the aggregation, the entire system bandwidth may be 110 or more PRBs.

Resource allocations of the downlink and the uplink are performed in asubframe unit in a time axis and in a PRB unit in the frequency axis.That is, two slots within a subframe are allocated in one resourceallocation signal.

A unit constituting a subcarrier and an OFDM symbol or a unitconstituting a subcarrier and an SC-FDMA symbol is referred to as aresource element. In resource mapping processing of a physical layer, amodulation symbol or the like is mapped to each resource element.

In processing of a physical layer of the downlink transport channel, theassignment of 24-bit cyclic redundancy check (CRC) to the PDSCH, channelcoding (transmission channel coding), physical-layer HARQ processing,channel interleaving, scrambling, modulation (quadrature phase shiftkeying (QPSK), 16 quadrature amplitude modulation (16QAM), or 64QAM),layer mapping, precoding, resource mapping, antenna mapping, and thelike are performed.

On the other hand, in processing of a physical layer of the uplinktransport channel, the assignment of 24-bit CRC to the PUSCH, channelcoding (transmission channel coding), physical-layer HARQ processing,scrambling, modulation (QPSK, 16QAM, or 64QAM), resource mapping,antenna mapping, and the like are performed.

The PDCCH, the PHICH, and the PCFICH are arranged in first 3 or fewerOFDM symbols.

In the PDCCH, transport format, resource allocation, and HARQinformation for the DL-SCH and the PCH is transmitted. The transportformat prescribes a modulation scheme, a coding scheme, a transportblock size, and the like.

In the PDCCH, transport format, resource allocation, and HARQinformation for the UL-SCH is transmitted.

A plurality of PDCCHs are supported, and the mobile station devicemonitors a set of PDCCHs.

The PDSCH allocated by the PDCCH is mapped to the same subframe as thatof the PDCCH.

The PUSCH allocated by the PDCCH is mapped to a subframe of a predefinedposition. For example, if a downlink subframe number of the PDCCH is N,it is mapped to uplink subframe No. N+4.

In uplink/downlink resource allocation by the PDCCH, the mobile stationdevice is specified using 16-bit MAC-layer identification information(MAC ID). That is, the 16-bit MAC ID is included in the PDCCH.

A downlink reference signal (downlink pilot channel) to be used formeasurement of a downlink state and demodulation of downlink data isarranged in first and second OFDM symbols of each slot and a third OFDMsymbol from behind.

On the other hand, an uplink demodulation reference signal (ademodulation pilot (demodulation reference signal: DRS)) to be used fordemodulation of the PUSCH is transmitted in a fourth SC-FDMA symbol ofeach slot.

An uplink measurement reference signal (a scheduling pilot (soundingreference signal: SRS)) to be used for measurement of an uplink state istransmitted in a last SC-FDMA symbol of a subframe.

A PUCCH demodulation reference signal is defined in each physical uplinkcontrol channel format, and is transmitted in third, fourth and fifthSC-FDMA symbols of each slot or second and sixth SC-FDMA symbols of eachslot.

The PBCH and the downlink synchronization signal are arranged in a bandof 6 physical resource blocks in the center of the system band. Thephysical downlink synchronization signal is transmitted in sixth andseventh OFDM symbols of each slot of subframes of a first subframe(subframe #F0) and a fifth subframe (subframe #F4).

The PBCH is transmitted in fourth and fifth OFDM symbols of the firstslot (slot #S0) and first and second OFDM symbols of the second slot(slot #S1) of the first subframe (subframe #F0).

The PRACH is constituted by a bandwidth of 6 physical resource blocks inthe frequency axis and 1 subframe in the time axis. The PRACH istransmitted for requests (an uplink resource request, an uplinksynchronization request, a downlink data transmission resumptionrequest, a handover request, a connection setup request, a reconnectionrequest, an MBMS service request, and the like) on various reasons fromthe mobile station device to the base station device.

The PUCCH is arranged in two ends of the system band and is constitutedin a PRB unit. Frequency hopping is performed so that the two ends ofthe system band are alternately used between slots.

FIG. 6 is a schematic block diagram showing a configuration of the basestation device 100 according to the first embodiment of the presentinvention. The base station device 100 includes a data control unit 101a, an OFDM modulation unit 102 a, a radio unit 103 a, a scheduling unit104, a channel estimation unit 105, a DFT-S-OFDM (DFT-Spread-OFDM)demodulation unit 106, a data extraction unit 107, an upper layer 108,and an antenna unit A1.

The radio unit 103 a, the scheduling unit 104, the channel estimationunit 105, the DFT-S-OFDM demodulation unit 106, the data extraction unit107, the upper layer 108, and the antenna unit A1 constitute a receptionunit. The data control unit 101 a, the OFDM modulation unit 102 a, theradio unit 103 a, the scheduling unit 104, the upper layer 108, and theantenna unit A1 constitute a transmission unit.

The antenna unit A1, the radio unit 103 a, the channel estimation unit105, the DFT-S-OFDM demodulation unit 106, and the data extraction unit107 perform processing of the physical layer of the uplink. The antennaunit A2, the data control unit 101 a, the OFDM modulation unit 102 a,and the radio unit 103 a perform processing of the physical layer of thedownlink.

The data control unit 101 a acquires the transport channel from thescheduling unit 104. The data control unit 101 a maps the transportchannel and a signal and a channel generated in the physical layer basedon scheduling information input from the scheduling unit 104 to thephysical channel based on the scheduling information input from thescheduling unit 104. Data mapped as described above is output to theOFDM modulation unit 102 a.

The OFDM modulation unit 102 a performs OFDM signal processing such ascoding, data modulation, serial/parallel conversion of an input signal,inverse fast Fourier transform (IFFT) processing, CP insertion,filtering, and the like for data input from the data control unit 101 abased on the scheduling information (including downlink PRB allocationinformation (including, for example, PRB position information such as afrequency and a time), a modulation scheme and a coding scheme (forexample, 16QAM modulation and a ⅔ coding rate) corresponding to eachdownlink PRB, or the like) input from the scheduling unit 104, generatesan OFDM signal, and outputs the OFDM signal to the radio unit 103 a.

The radio unit 103 a generates a radio signal by up-convertingmodulation data input from the OFDM modulation unit 102 a into a radiofrequency, and transmits the radio signal to the mobile station device200 (see FIG. 7 to be described later) via the antenna unit A1. Theradio unit 103 a receives an uplink radio signal from the mobile stationdevice 200 via the antenna unit A1, down-converts the uplink radiosignal into a baseband signal, and outputs reception data to the channelestimation unit 105 and the DFT-S-OFDM demodulation unit 106.

The scheduling unit 104 performs processing of the MAC (Medium AccessControl) layer. The scheduling unit 104 performs mapping of the logicalchannel and the transport channel, downlink and uplink scheduling (HARQprocessing, transport format selection, and the like), and the like.Since the scheduling unit 104 integrates and controls processing unitsof the physical layers, interfaces are provided between the schedulingunit 104 and the antenna unit A1, the radio unit 103 a, the channelestimation unit 105, the DFT-S-OFDM demodulation unit 106, the datacontrol unit 101 a, the OFDM modulation unit 102 a, and the dataextraction unit 107. However, their illustration is omitted in FIG. 6.

In downlink scheduling, the scheduling unit 104 generates schedulinginformation to be used in processing of selection of a downlinktransport format (transmission format) (PRB allocation and modulationschemes, a coding scheme, and the like) for modulating data,retransmission control in the HARQ, and the downlink scheduling based onfeedback information (a downlink channel feedback report (channelquality (CQI), the number of streams (RI), precoding information (PMI),and the like)), ACK/NACK feedback information for downlink data, or thelike) received from the mobile station device 200, information ofavailable downlink PRBs of each mobile station device, a buffersituation, scheduling information input from the upper layer 108, andthe like. The scheduling information that is used in the downlinkscheduling is output to the data control unit 101 a and the dataextraction unit 107.

In uplink scheduling, the scheduling unit 104 generates schedulinginformation to be used in processing of selection of an uplink transportformat (transmission format) (PRB allocation and modulation schemes, acoding scheme, and the like) for modulating data and the uplinkscheduling based on an estimation result of an uplink channel state(radio propagation channel state) output by the channel estimation unit105, a resource allocation request from the mobile station device 200,information of available PRBs of each mobile station device 200,scheduling information input from the upper layer 108, and the like.

The scheduling information that is used in the uplink scheduling isoutput to the data control unit 101 a and the data extraction unit 107.

The scheduling unit 104 maps the logical channel of the downlink inputfrom the upper layer 108 to the transport channel, and outputs a mappingresult to the data control unit 101 a. Also, the scheduling unit 104processes control data and the transport channel acquired in the uplinkinput from the data extraction unit 107 if necessary, maps a processingresult to the logical channel of the uplink, and outputs a mappingresult to the upper layer 108.

The channel estimation unit 105 estimates an uplink channel state froman uplink DRS for uplink data demodulation, and outputs an estimationresult to the DFT-S-OFDM demodulation unit 106. Also, to perform theuplink scheduling, the uplink channel state is estimated from an uplinkSRS and an estimation result is output to the scheduling unit 104.

An uplink communication scheme is assumed to be a single carrier schemesuch as DFT-S-OFDM or the like, but a multi-carrier scheme such as anOFDM scheme may be used.

Based on the uplink channel state estimation result input from thechannel estimation unit 105, the DFT-S-OFDM demodulation unit 106performs demodulation processing by performing DFT-S-OFDM signalprocessing such as discrete Fourier transform (DFT) conversion,subcarrier mapping, IFFT conversion, filtering, and the like formodulation data input from the radio unit 103 a, and outputs aprocessing result to the data extraction unit 107.

Based on the scheduling information from the scheduling unit 104, thedata extraction unit 107 checks the accuracy of data input from theDFT-S-OFDM demodulation unit 106, and outputs a check result(acknowledgment signal ACK/negative acknowledgement signal NACK) to thescheduling unit 104.

Also, based on the scheduling information input from the scheduling unit104, the data extraction unit 107 separates the transport channel andthe control data of the physical layer from data input from theDFT-S-OFDM demodulation unit 106, and outputs the transport channel andthe control data to the scheduling unit 104.

The separated control data includes feedback information (a downlinkchannel feedback report (CQI, PMI, and RI) and ACK/NACK feedbackinformation for downlink data) reported from the mobile station device200, and the like.

The upper layer 108 performs processing of a packet data convergenceprotocol (PDCP) layer, a radio link control (RLC) layer, and a radioresource control (RRC) layer. Since the upper layer 108 integrates andcontrols processing units of the lower layers, interfaces are providedbetween the upper layer 108 and the scheduling unit 104, the antennaunit A1, the radio unit 103 a, the channel estimation unit 105, theDFT-S-OFDM demodulation unit 106, the data control unit 101 a, the OFDMmodulation unit 102 a, and the data extraction unit 107. However, theirillustration is omitted in FIG. 6.

The upper layer 108 has a radio resource control unit 109. The radioresource control unit 109 performs management of various types ofsetting information, management of system information, paging control,management of a communication state of each mobile station device,mobility management of a handover and the like, management of a buffersituation of each mobile station device, management of connection setupof unicast and multicast bearers, management of a mobile stationidentifier (UEID), and the like. The upper layer 108 transmits/receivesinformation directed to another base station device and informationdirected to an upper node.

FIG. 7 is a schematic block diagram showing a configuration of themobile station device 200 according to the first embodiment of thepresent invention. The mobile station device 200 includes a data controlunit 201, a DFT-S-OFDM modulation unit 202, a radio unit 203 a, ascheduling unit 204, a channel estimation unit 205 a, an OFDMdemodulation unit 206 a, a data extraction unit 207 a, an upper layer208, and an antenna unit A2.

The data control unit 201, the DFT-S-OFDM modulation unit 202, the radiounit 203 a, the scheduling unit 204, the upper layer 208, and theantenna unit A2 constitute a transmission unit. The radio unit 203 a,the scheduling unit 204, the channel estimation unit 205 a, the OFDMdemodulation unit 206 a, the data extraction unit 207 a, the upper layer208, and the antenna unit A2 constitute a reception unit. The schedulingunit 204 constitutes a selection unit.

The antenna unit A2, the data control unit 201, the DFT-S-OFDMmodulation unit 202, and the radio unit 203 a perform processing of thephysical layer of the uplink. The antenna unit A2, the radio unit 203 a,the channel estimation unit 205 a, the OFDM demodulation unit 206 a, andthe data extraction unit 207 a perform processing of the physical layerof the downlink.

The data control unit 201 acquires the transport channel from thescheduling unit 204. The data control unit 201 maps the transportchannel and a signal and a channel generated in the physical layer basedon scheduling information input from the scheduling unit 204, to thephysical channel. The data mapped as described above is output to theDFT-S-OFDM modulation unit 202.

The DFT-S-OFDM modulation unit 202 performs DFT-S-OFDM signal processingsuch as data modulation, DFT processing, subcarrier mapping, IFFTprocessing, CP insertion, filtering, and the like, generates aDFT-S-OFDM signal, and outputs the DFT-S-OFDM signal to the radio unit203 a.

An uplink communication scheme is assumed to be a single carrier schemesuch as DFT-S-OFDM or the like, but a multi-carrier scheme such as anOFDM scheme may be used in place thereof.

The radio unit 203 a generates a radio signal by up-convertingmodulation data input from the DFT-S-OFDM modulation unit 202 into aradio frequency, and transmits the radio signal to the base stationdevice 100 (FIG. 6) via the antenna unit A2.

The radio unit 203 a receives a radio signal modulated by downlink datafrom the base station device 100 via the antenna unit A2, down-convertsthe radio signal into a baseband signal, and outputs reception data tothe channel estimation unit 205 a and the OFDM demodulation unit 206 a.

The scheduling unit 204 performs processing of the MAC layer. Thescheduling unit 204 performs mapping of the logical channel and thetransport channel, downlink and uplink scheduling (HARQ processing,transport format selection, and the like), and the like. Since thescheduling unit 104 integrates and controls processing units of thephysical layers, interfaces are provided between the scheduling unit 104and the antenna unit A2, the data control unit 201, the DFT-S-OFDMmodulation unit 202, the channel estimation unit 205 a, the OFDMdemodulation unit 206 a, the data extraction unit 207 a, and the radiounit 203 a. However, their illustration is omitted in FIG. 7.

In downlink scheduling, the scheduling unit 204 generates schedulinginformation to be used in reception control of the transport channel,the physical signal, and the physical channel, HARQ retransmissioncontrol, and the downlink scheduling based on scheduling information(transport format or HARQ retransmission information) and the like fromthe base station device 100 or the upper layer 208. The schedulinginformation that is used in the downlink scheduling is output to thedata control unit 201 and the data extraction unit 207 a.

In uplink scheduling, the scheduling unit 204 generates schedulinginformation to be used in scheduling processing for mapping the logicalchannel of the uplink input from the upper layer 208 to the transportchannel and the uplink scheduling based on a buffer situation of theuplink input from the upper layer 208, uplink scheduling informationfrom the base station device 100 input from the data extraction unit 207a, scheduling information input from the upper layer 208, and the like.The scheduling information is transport format or HARQ retransmissioninformation, and the like.

In the uplink transport format, information reported from the basestation device 100 is used. The scheduling information is output to thedata control unit 201 and the data extraction unit 207 a.

The scheduling unit 204 maps the logical channel of the uplink inputfrom the upper layer 208 to the transport channel, and outputs a mappingresult to the data control unit 201. The scheduling unit 204 alsooutputs a downlink channel feedback report (CQI, PMI, and RI) input fromthe channel estimation unit 205 a or a CRC check result input from thedata extraction unit 207 a to the data control unit 201.

Also, the scheduling unit 204 processes the control data and thetransport channel acquired in the downlink input from the dataextraction unit 207 a if necessary, maps a processing result to thelogical channel of the downlink, and outputs a mapping result to theupper layer 208.

The channel estimation unit 205 a estimates a downlink channel statefrom a downlink reference signal (RS) for downlink data modulation, andoutputs an estimation result to the OFDM demodulation unit 206 a.

The channel estimation unit 205 a estimates a downlink channel statefrom the downlink RS so as to notify the base station device 100 of anestimation result of the downlink channel state (radio propagationchannel state), converts an estimation result into a downlink channelfeedback report (channel quality information and the like), and outputsthe downlink channel feedback report to the scheduling unit 204.

The OFDM demodulation unit 206 a performs OFDM demodulation processingfor modulation data input from the radio unit 203 a based on thedownlink channel state estimation result input from the channelestimation unit 205 a, and outputs a processing result to the dataextraction unit 207 a.

The data extraction unit 207 a performs CRC for data input from the OFDMdemodulation unit 206 a, checks accuracy, and outputs a check result(ACK/NACK feedback information) to the scheduling unit 204.

The data extraction unit 207 a separates the transport channel and thecontrol data of the physical layer from data input from the OFDMdemodulation unit 206 a based on the scheduling information from thescheduling unit 204, and outputs the transport channel and the controldata to the scheduling unit 204. The separated control data includesscheduling information such as downlink or uplink resource allocation oruplink HARQ control information. At this time, a search space (alsoreferred to as a search region) of the PDCCH is decoded and downlink oruplink resource allocation or the like destined for its own station isextracted.

The upper layer 208 performs processing of the PDCP layer, the RLClayer, and the RRC layer. The upper layer 208 has a radio resourcecontrol unit 209. Since the upper layer 208 integrates and controlsprocessing units of the lower layers, interfaces are provided betweenthe upper layer 208 and the scheduling unit 204, the antenna unit A2,the data control unit 201, the DFT-S-OFDM modulation unit 202, thechannel estimation unit 205 a, the OFDM demodulation unit 206 a, thedata extraction unit 207 a, and the radio unit 203 a. However, theirillustration is omitted in FIG. 7.

The radio resource control unit 209 performs management of various typesof setting information, management of system information, pagingcontrol, management of a communication state of its own station,mobility management of a handover and the like, management of a buffersituation, management of connection setup of unicast and multicastbearers, and management of a mobile station identifier (UEID).

FIG. 8 is a schematic block diagram showing configurations of the datacontrol unit 101 a, the OFDM modulation unit 102 a, and the radio unit103 a related to the transmission unit of the base station device 100(FIG. 6) according to the first embodiment of the present invention.Here, the case where frequency aggregation is applied to the downlink inthe base station device 100 (FIG. 6) will be described.

The data control unit 101 a includes the physical mapping unit 301, thereference signal generation unit 302, and the synchronization signalgeneration unit 303. The reference signal generation unit 302 generatesa downlink reference signal and outputs the downlink reference signal tothe physical mapping unit 301. The synchronization signal generationunit 303 generates a synchronization signal and outputs thesynchronization signal to the physical mapping unit 301.

The physical mapping unit 301 maps the transport channel to PRBs basedon the scheduling information, and multiplexes the reference signalgenerated in the reference signal generation unit 302 and thesynchronization signal generated in the synchronization signalgeneration unit 303 into a physical frame.

At this time, the scheduling information includes information related toa system bandwidth. The physical mapping unit 301 maps the transportchannel to PRBs arranged in the band of N₁W_(PRB) within the system bandW1 and PRBs arranged in the band of N₂W_(PRB) within the system band W2,and inserts a null signal into subcarriers of a band other than thesystem bands W1 and W2 and a guard band. The physical mapping unit 301maps the PBCH including information related to the system bandwidth.

The OFDM modulation unit 102 a includes a modulation unit 304, an IFFTunit 305, and a CP insertion unit 306.

The modulation unit 304 generates a modulation symbol by modulatinginformation mapped to each resource element of a physical frame based ona modulation scheme of QPSK modulation/16QAM modulation/64QAMmodulation, or the like, and outputs the modulation symbol to the IFFTunit 305.

The IFFT unit 305 transforms a frequency domain signal into a timedomain signal by performing IFFT for the modulation symbol (a modulationsymbol arranged on a plane in the frequency axis and the time axis)generated in the modulation unit 304, and outputs the time domain signalto the CP insertion unit 306.

The CP insertion unit 306 generates an OFDM symbol by inserting a CPinto the time domain signal, and outputs the OFDM symbol to the D/Aconversion unit 307 of the radio unit 103 a.

The radio unit 103 a includes a D/A conversion unit 307 and a radiotransmission unit 308.

The D/A conversion unit 307 converts an OFDM symbol sequence of anoutput of the CP insertion unit 306, which is a digital signal, into ananalog signal, and outputs the analog signal to the radio transmissionunit 308.

The radio transmission unit 308 up-converts the analog signal into aradio frequency with use of a carrier frequency f shown in FIG. 9, andtransmits the generated signal to the mobile station device 200 (FIG. 7)via the antenna unit A1. In FIG. 9, the horizontal axis represents afrequency. FIG. 9 shows the case where a signal is transmitted from thebase station device 100 to the mobile station device 200 with use of thesystem band W1 and the system band W2.

FIG. 10 is a schematic block diagram showing configurations of the radiounit 203 a, the channel estimation unit 205 a, the OFDM demodulationunit 206 a, and the data extraction unit 207 a related to the receptionunit of the mobile station device 200 (FIG. 7) according to the firstembodiment of the present invention. Here, the case where frequencyaggregation is applied to the downlink in the mobile station device 200will be described.

The radio unit 203 a includes a radio reception unit 401 and an A/Dconversion unit 402.

The radio reception unit 401 receives a signal from the base stationdevice 100 (FIG. 6) via the antenna unit A2, and down-converts thereceived signal into a baseband with use of a carrier frequency f shownin FIG. 9. Also, the radio reception unit 401 acquires synchronizationby referring to a synchronization signal inserted in advance into asignal by cell selection or reselection processing, and sets up andestablishes a connection in the system bands W1 and W2 with use ofinformation regarding the system bands reported from the scheduling unit104 or the upper layer. The radio reception unit 401 uses an output ofthe A/D conversion unit 402 when synchronization is acquired using adigital signal.

The A/D conversion unit 402 converts an analog signal of the output ofthe radio reception unit 401 into a digital signal, and outputs thedigital signal to the channel estimation unit 205 a and the CP removalunit 403 of the OFDM demodulation unit 206 a.

The OFDM demodulation unit 206 a includes a CP removal unit 403, an FFTunit 404, and a demodulation unit 405. The CP removal unit 403 removes aCP part from the digital signal output from the A/D conversion unit 402.

A time domain signal from which the CP is removed in the CP removal unit403 is transformed into a modulation symbol (a modulation symbolarranged on a plane in the frequency axis and the time axis) of resourceelements in the FFT unit 404.

The demodulation unit 405 performs demodulation processing, whichcorresponds to the modulation scheme used in the modulation unit 304,for the modulation symbol into which the transformation is performedwhile referring to a propagation channel estimation value estimated inthe propagation channel estimation unit 205 a, and acquires a bitsequence (or bit likelihood information or the like).

If data extraction is prepared and set using information within the PBCHby cell selection or reselection processing, the data extraction unit207 a extracts broadcast information from PRBs of a band including thePBCH, and prepares and sets the data extraction in the system bands W1and W2.

Alternatively, once the scheduling unit 104 is notified of the broadcastinformation or the upper layer is notified of the broadcast informationvia the scheduling unit 104, the data extraction is set in the systembands W1 and W2 based on instructions thereof. At this time, thescheduling unit 104 or the upper layer notifies the radio reception unit401 of information regarding the system bands.

If data for which data extraction is already set in the system bands W1and W2 is received (normal communication is performed), the dataextraction unit 207 a maps PRBs to the transport channel. At this time,the data extraction unit 207 a removes a signal in subcarriers of a bandother than the system bands W1 and W2 and a guard band, and maps PRBsarranged in a band of N₁W_(PRB) within the system band W1 and PRBsarranged in a band of N₂W_(PRB) within the system band W2 to thetransport channel.

As a modified example of the first embodiment, the configuration of thebase station device shown in FIG. 12 or the configuration of the mobilestation device shown in FIG. 13 may be used. In this regard, if thisconfiguration is used, carrier frequencies f′1 and f′2 as shown in FIG.11 are used.

FIG. 11 is a diagram showing an example of bands used in the radiocommunication system according to the first embodiment of the presentinvention. In FIG. 11, the horizontal axis represents a frequency. Inthis modified example, a signal is transmitted from the base stationdevice to the mobile station device with use of frequencies of systembands W′1 and W′2. The carrier frequency of the system band W′1 is f′1and the carrier frequency of the system band W′2 is f′2.

The base station device may transmit a signal to the mobile stationdevice with use of only one system band. In this case, it is preferableto use a configuration like the base station device 100 (FIG. 6) of thefirst embodiment. A configuration like the configuration shown in FIG. 4can be used as a subframe structure related to this modified example.

The PBCH that is a channel including a synchronization signal, which isa signal for synchronization, and physical broadcast information isinserted into any one (here, the system band W′1) of the system bands.

The mobile station device first acquires frame synchronization bysearching for the synchronization signal, and also acquires informationwithin the PBCH. Information (information regarding an aggregationresource region including the system band W′2) indicating a system bandis included in the information within the PBCH. The system bands W′1 andW′2 are received using the information.

At this time, N₁ PRBs are arranged in the system band W′1 and N₂ PRBsare arranged in the system band W′2. Thereby, a propagation channelcharacteristic in the inside of the PRB becomes continuous in any PRB.Thus, it is possible to prevent the degradation of accuracy ofpropagation channel estimation or reception quality measurement.

FIG. 12 is a schematic block diagram showing configurations of a datacontrol unit 101 b, an OFDM modulation unit 102 b, and a radio unit 103b of the base station device according to a modified example of thefirst embodiment of the present invention. Here, the case wherefrequency aggregation is applied to the downlink in the base stationdevice will be described.

The base station device according to the modified example of the firstembodiment includes the data control unit 101 b, the OFDM modulationunit 102 b, and the radio unit 103 b in place of the data control unit101 a, the OFDM modulation unit 102 a, and the radio unit 103 a (FIG. 8)of the base station device 100 according to the first embodiment.

The data control unit 101 b includes a physical mapping unit 501, areference signal generation unit 502, and a synchronization signalgeneration unit 503.

The reference signal generation unit 502 generates a downlink referencesignal and outputs the downlink reference signal to the physical mappingunit 5011. The synchronization signal generation unit 503 generates asynchronization signal and outputs the synchronization signal to thephysical mapping unit 501. The physical mapping unit 501 maps thetransport channel to PRBs based on scheduling information, and alsomultiplexes the reference signal generated in the reference signalgeneration unit 502 and the synchronization signal generated in thesynchronization signal generation unit 503 into a physical frame.

At this time, information related to system bandwidths W′1 and W′2 isincluded in the scheduling information. The physical mapping unit 501maps the transport channel to PRBs arranged in a band of N₁W_(PRB)within the system band W′1 and PRBs arranged in a band of N₂W_(PRB)within the system band W′2.

The OFDM modulation unit 102 b includes modulation units 504-1 and504-2, IFFT units 505-1 and 505-2, and CP insertion units 506-1 and506-2.

The modulation unit 504-1, the IFFT unit 505-1, and the CP insertionunit 506-1 process the PRBs arranged in the band of N₁W_(PRB) within thesystem band W′1.

The modulation unit 504-1 generates a modulation symbol by modulatinginformation mapped to each resource element of a physical frame based ona modulation scheme of QPSK modulation, 16QAM modulation, 64QAMmodulation, or the like, and outputs the modulation symbol to the IFFTunit 505-1.

The IFFT unit 505-1 transforms a frequency domain signal into a timedomain signal by performing IFFT for the modulation symbol (a modulationsymbol arranged on a plane in the frequency axis and the time axis)generated in the modulation unit 504-1, and outputs the time domainsignal to the CP insertion unit 506-1.

The CP insertion unit 506-1 generates an OFDM symbol by inserting a CPinto the time domain signal, and outputs the OFDM symbol to a D/Aconversion unit 507-1 of the radio unit 103 b.

The modulation unit 504-2, the IFFT unit 505-2, and the CP insertionunit 506-2 process the PRBs arranged in the band of N₂W_(PRB) within thesystem band W′2.

The modulation unit 504-2 generates a modulation symbol by modulatinginformation mapped to each resource element of a physical frame based ona modulation scheme of QPSK modulation, 16QAM modulation, 64QAMmodulation, or the like, and outputs the modulation symbol to the IFFTunit 505-2.

The IFFT unit 505-2 transforms a frequency domain signal into a timedomain signal by performing IFFT for the modulation symbol (a modulationsymbol arranged on a plane in the frequency axis and the time axis)generated in the modulation unit 504-2, and outputs the time domainsignal to the CP insertion unit 506-2.

The CP insertion unit 506-2 generates an OFDM symbol by inserting a CPinto the time domain signal, and outputs the OFDM symbol to a D/Aconversion unit 507-2 of the radio unit 103 b.

The radio unit 103 b includes the D/A conversion units 507-1 and 507-2and radio transmission units 508-1 and 508-2.

The D/A conversion unit 507-1 and the radio transmission unit 508-1process the PRBs arranged in the band of N₁W_(PRB) within the systemband W′1.

The D/A conversion unit 507-1 converts an OFDM symbol sequence of anoutput of the CP insertion unit 506-1, which is a digital signal, intoan analog signal, and outputs the analog signal to the radiotransmission unit 508-1.

The radio transmission unit 508-1 up-converts the analog signal into aradio frequency with use of a carrier frequency W′1 shown in FIG. 11,and transmits the generated signal to the mobile station device via theantenna unit A1.

The D/A conversion unit 507-2 and the radio transmission unit 508-2process the PRBs arranged in the band of N₂W_(PRB) within the systemband W′2.

The D/A conversion unit 507-2 converts an OFDM symbol sequence of anoutput of the CP insertion unit 506-2, which is a digital signal, intoan analog signal, and outputs the analog signal to the radiotransmission unit 508-2.

The radio transmission unit 508-2 up-converts the analog signal into aradio frequency with use of a carrier frequency W′2 shown in FIG. 11,and transmits the generated signal to the mobile station device via theantenna unit A1.

Here, blocks divided to perform the same processing for differentsignals have been described, but one circuit may be shared.

FIG. 13 is a schematic block diagram showing configurations of a radiounit 203 b, a channel estimation unit 205 b, an OFDM demodulation unit206 b, and a data extraction unit 207 b of the mobile station deviceaccording to the modified example of the first embodiment of the presentinvention. Here, the case where frequency aggregation is applied to thedownlink in the mobile station device will be described.

In FIG. 13, a signal output by a band-specific channel estimation unit603-1 is input to a demodulation unit 606-1. A signal output by aband-specific channel estimation unit 603-2 is input to a demodulationunit 606-2.

The mobile station device according to the modified example of the firstembodiment includes the radio unit 203 b, the channel estimation unit205 b, the OFDM demodulation unit 206 b, and the data extraction unit207 b in place of the radio unit 203 a, the channel estimation unit 205a, the OFDM demodulation unit 206 a, and the data extraction unit 207 a(FIG. 10) of the mobile station device 200 according to the firstembodiment.

The radio unit 203 b includes radio reception units 601-1 and 601-2 andA/D conversion units 602-1 and 602-2.

The radio reception unit 601-1 receives a signal from the base stationdevice via the antenna unit A2, and down-converts the received signalinto a baseband with use of the carrier frequency f′1 shown in FIG. 11.Also, the radio reception unit 601-1 acquires synchronization byreferring to a synchronization signal inserted in advance into a signalby cell selection or reselection processing, and sets up and establishesa connection in the system band W′1 with use of information regardingthe system band reported from the scheduling unit 204 or the upperlayer. The radio reception unit 601-1 uses an output of the A/Dconversion unit 602-1 described below when synchronization is acquiredusing a digital signal.

The A/D conversion unit 602-1 converts an analog signal of an output ofthe radio reception unit 601-1 into a digital signal, and outputs thedigital signal to the band-specific channel estimation unit 603-1 of thechannel estimation unit 205 b and the CP removal unit 604-1 of the OFDMdemodulation unit 206 b.

The radio reception unit 601-2 sets up and establishes a connection inthe system band W′2 with use of information regarding the system bandreported from the scheduling unit 204 or the upper layer, receives asignal from the base station device via the antenna unit A2,down-converts the received signal into a baseband with use of thecarrier frequency f′2 shown in FIG. 11 based on timing of framesynchronization acquired in the radio reception unit 601-1, and outputsthe down-converted signal to the A/D conversion unit 602-2.

The A/D conversion unit 602-2 converts an analog signal of an output ofthe radio reception unit 601-2 into a digital signal, and outputs thedigital signal to the band-specific channel estimation unit 603-2 of thechannel estimation unit 205 b and the CP removal unit 604-2 of the OFDMdemodulation unit 206 b.

The channel estimation unit 205 b includes the band-specific channelestimation units 603-1 and 603-2.

The band-specific channel estimation unit 603-1 performs channelestimation in the PRBs arranged in the band of N₁W_(PRB) by referring toa reference signal in the PRBs arranged in the band of N₁W_(PRB) in thesystem band W′1, and outputs an estimation result to the demodulationunit 606-1 of the OFDM demodulation unit 206 b.

The band-specific channel estimation unit 603-2 performs channelestimation in the PRBs arranged in the band of N₂W_(PRB) by referring toa reference signal in the PRBs arranged in the band of N₂W_(PRB) in thesystem band W′2, and outputs an estimation result to the demodulationunit 606-2 of the OFDM demodulation unit 206 b.

The OFDM demodulation unit 206 b includes CP removal units 604-1 and604-2, FFT units 605-1 and 605-2, and demodulation units 606-1 and606-2.

The CP removal unit 604-1, the FFT unit 605-1, and the demodulation unit606-1 process the PRBs arranged in the band of N₁W_(PRB) in the systemband W′1.

The CP removal unit 604-1 removes a CP part from the digital signaloutput from the A/D conversion unit 602-1.

A time domain signal from which a CP is removed in the CP removal unit604-1 is transformed into a modulation symbol (a modulation symbolarranged on a plane in the frequency axis (the band of N₁W_(PRB)) andthe time axis) of each resource element in the FFT unit 605-1, and themodulation symbol is output to the FFT unit 605-1.

The demodulation unit 606-1 performs demodulation processing, whichcorresponds to the modulation scheme used in the modulation unit 504-1,for the modulation symbol into which the transformation is performedwhile referring to a propagation channel estimation value estimated inthe propagation channel estimation unit 603-1, and acquires a bitsequence (or bit likelihood information or the like).

The CP removal unit 604-2, the FFT unit 605-2, and the demodulation unit606-2 process the PRBs arranged in the band of N₂W_(PRB) in the systemband W′2.

The CP removal unit 604-2 removes a CP part from the digital signaloutput from the A/D conversion unit 602-2, and outputs a removal resultto the FFT unit 605-2.

A time domain signal from which a CP is removed in the CP removal unit604-2 is transformed into a modulation symbol (a modulation symbolarranged on a plane in the frequency axis (the band of N₂W_(PRB)) andthe time axis) of each resource element in the FFT unit 605-2, and themodulation symbol is output to the demodulation unit 606-2.

The demodulation unit 606-2 performs demodulation processing, whichcorresponds to the modulation scheme used in the modulation unit 504-2,for the modulation symbol into which the transformation is performedwhile referring to a propagation channel estimation value estimated inthe propagation channel estimation unit 603-2, and acquires a bitsequence (or bit likelihood information or the like).

If data extraction is prepared and set using information within the PBCHby cell selection or reselection processing, the data extraction unit207 extracts broadcast information from PRBs of a band including thePBCH, and prepares and sets the data extraction in the system bands W′1and W′2.

Alternatively, once the scheduling unit 204 is notified of the broadcastinformation or the upper layer is notified of the broadcast informationvia the scheduling unit 204, the data extraction is set in the systembands W′1 and W′2 based on instructions thereof. At this time, thescheduling unit 204 or the upper layer notifies the radio receptionunits 601-1 and 601-2 of information regarding the system bands.

If data for which data extraction is already set in the system bands W′1and W′2 is received (normal communication is performed), the dataextraction unit 207 b maps PRBs to the transport channel based on thescheduling information. At this time, the data extraction unit 207 bmaps PRBs arranged in the band of N₁W_(PRB) within the system band W′1,which is an output of the demodulation unit 606-1, and PRBs arranged inthe band of N₂W_(PRB) within the system band W′2, which is an output ofthe demodulation unit 606-2, to the transport channel.

Here, blocks divided to perform the same processing for differentsignals have been described, but one circuit may be shared.

Processing of the base station device 100 and the mobile station device200 will be described by returning to the description of the firstembodiment.

A master region is a downlink frequency layer (system band) to beinitially accessed by the mobile station device 200, and the mobilestation device 200 can access another region (slave region) afteracquiring a signal of the region. A downlink synchronization signal(SCH) by which at least downlink synchronization can be acquired isarranged.

The slave region is a downlink frequency layer (system band) to beaccessed after the mobile station device 200 acquires information in themaster region.

The master region and the slave region may be different for each mobilestation device 200. That is, the master region for a certain mobilestation device 200 may be configured to be the slave region of anothermobile station device 200. In this case, the downlink synchronizationsignal (SCH) may be arranged even in the slave region for a certainmobile station device 200. The presence/absence of specific channels(the downlink synchronization signal (SCH), the physical downlinkbroadcast channel (PBCH), the BCCH, the PCCH, the CCCH, and/or the like)of the slave region is broadcast from the base station device 100 to themobile station device 200 by the master region.

The master region and the slave region may be arranged at adjacentcarrier frequencies or separated carrier frequencies.

Uplink and downlink PRB resource allocations are performed by the PDCCH.A format in which PRB resources of the master region are allocated, aformat in which PRB resources of the slave region are allocated, and aformat in which PRB resources of both the master and slave regions areallocated are prepared. The mobile station device 200 changes the formatof the PDCCH to be monitored in response to detection of the fact thatthe mobile station device 200 can access the master region and/or theslave region.

Alternatively, the format directed to the mobile station device 200 toaccess only the master or slave region and the format directed to themobile station device 200 to access both the master and slave regionsare prepared by the PDCCH. The mobile station device 200 changes theformat of the PDCCH to be monitored in response to detection of the factthat the master and/or slave regions can be accessed.

FIG. 14( b) is a sequence diagram showing processing of the radiocommunication system according to the first embodiment of the presentinvention.

First, the mobile station device 200 acquires a downlink synchronizationsignal (SCH) transmitted from the base station device 100 by cellselection or reselection processing, and performs downlinksynchronization processing (step S101). At this time, the downlinksynchronization signal (SCH) is arranged in a master region Z01 (seeFIG. 14( a)).

The mobile station device 200 acquires the PBCH so that processing isperformed in the master region Z01 (manipulation is performed in themaster region Z01) (step S102). At this time, information regarding anaggregation resource region including a slave region Z02 (see FIG. 14(a)) (information indicating a system bandwidth (the number of resourceblocks) of the master region Z01, a carrier frequency, a systembandwidth (the number of resource blocks), or the like of the slaveregion Z02, version information of the mobile station device 200, and/orthe like), and the like is acquired from the PBCH.

Information regarding aggregation resources includes information forrecognizing a width of a guard band between the master region Z01 andthe slave region Z02 or between a plurality of system bands included inthe entire system. Here, the width of the guard band between the systembands is defined as a width between effective bands excluding the guardband included in the system band. That is, it is a bandwidth betweenadjacent effective resource blocks within the system.

For example, if bandwidths each including a guard band are W₁, W₂, W₃,and W₄, and bandwidths between the system bands are W_(D1-2), W_(D2-3),and W_(D3-4) in the case where system bands SW1, SW2, SW3, and SW4 areconfigured, effective bandwidths each excluding the guard band areautomatically calculated from N₁W_(PRB), N₂W_(PRB), N₃W_(PRB), andN₄W_(PRB). At this time, system bandwidths each including the guard band(information of the master region Z01 may be omitted), bandwidthsbetween the system bands, and effective bandwidths (information of themaster region Z01 may be omitted) are included in the informationregarding the aggregation resource region.

FIG. 15 is a diagram showing an example of a configuration of systembands used in the first embodiment of the present invention. In FIG. 15,the horizontal axis represents a frequency. In FIG. 15, a guard band isarranged in a shaded region (for example, a region R11). For example, asshown in FIG. 15, if system bands SW1, SW2, SW3, and SW4 are configured,it is assumed that bandwidths each including a guard band are W₁, W₂,W₃, and W₄, bandwidths between the system bands are W_(D1-2), W_(D2-3),and W_(D3-4), and effective bandwidths each excluding the guard band areN₁W_(PRB), N₂W_(PRB), N₃W_(PRB), and N₄W_(PRB). In this case, the guardband included in each system band is automatically calculated fromW_(i)-N_(i)W_(PRB). At this time, system bandwidths each including theguard band (information of the master region Z01 may be omitted),bandwidths between the system bands, and effective bandwidths(information of the master region may be omitted) are included in theinformation regarding the aggregation resource region.

FIG. 16 is a diagram showing another example of a configuration ofsystem bands used in the first embodiment of the present invention. InFIG. 16, the horizontal axis represents a frequency. In FIG. 16, a guardband is arranged in a shaded region (for example, a region R12). Forexample, as shown in FIG. 16, if system bands SW1, SW2, SW3, and SW4 areconfigured, effective bandwidths N₁W_(PRB), N₂W_(PRB), N₃W_(PRB), andN₄W_(PRB), a guard band N_(G1-2)W_(PRB) between the system bands SW1 andSW2, a guard band N_(G2-3)W_(PRB) between the system bands SW2 and SW3,and a guard band N_(G3-4)W_(PRB) between the system bands SW3 and SW4are broadcast. Each bandwidth may be expressed by a signal of the numberof resource blocks, N₁. If N₁, N₂, N₃, and N₄, which are the number ofPRBs, are the same value, it is preferable to broadcast only one valueN_(i). Processing of the mobile station device 200, which is a receiver,is facilitated by configuring the guard band by an integer multiple ofW_(PRB). If the guard bands N_(G1-2), N_(G2-3), and N_(G3-4) are thesame value, it is preferable to broadcast only one value N_(G). In asituation where the mobile station device 200 can perform receptionwithout the guard band, the guard band may be designated as 0. In thiscase, N_(G)=0 is broadcast.

Indices capable of specifying all or each of W₁, W₂, W₃, W₄, N₁W_(PR),N₂W_(PR), N₃W_(PRB), N₄W_(PRB), N_(G1-2)W_(PRB), N_(G2-3)W_(PRB), andN_(G3-4)W_(PRB) may be defined. Only the indices are broadcast, so thatthe mobile station device 200 may specify the above-described valuesfrom the indices.

If there is no information regarding aggregation resources, continuousprocessing is performed so that manipulation is directly performed inthe master region Z01. Information regarding the aggregation resourceregion including the slave region Z02 may be arranged in a regionseparated from the PBCH.

For example, the PBCH is transmitted in first, second, third, and fourthOFDM symbols of a second slot (slot #1) of a first subframe (subframe#0), but a new PBCH may be transmitted in fifth to seventh OFDM symbolsof a second slot (slot #1).

The base station device 100 includes information regarding anaggregation resource region including the slave region Z02 in the newPBCH, and transmits the new PBCH to the mobile station device 200 (stepS103 of FIG. 14( b)).

The mobile station device 200 having the capability for aggregationacquires both of the PBCH transmitted in the first, second, third, andfourth OFDM symbols of the second slot (slot #1) and the new PBCHtransmitted in the fifth to seventh OFDM symbols of the second slot(slot #1).

Thereby, information for the mobile station device 200 (the mobilestation device 200 capable of accessing the master region Z01 and theslave region Z02) having the capability for aggregation and informationfor the mobile station device 200 (the mobile station device Z02 capableof accessing only the master region Z01) without the capability foraggregation can be efficiently separated.

If the information regarding the aggregation resource region is acquired(if the new PBCH is successfully decoded), the mobile station device 200adjusts the radio unit to receive up to the slave region Z02, ifnecessary (step S104 of FIG. 14( b)).

If the adjustment of the radio unit 203 a (FIG. 7) is not necessary (ifthe master region Z01 and the slave region Z02 are adjacent), acountermeasure is taken by adjusting a channel acquisition unit.Continuous processing is performed so that manipulation is performed inthe aggregation resource region. That is, the mobile station device 200performs decoding of the PDCCH on the assumption of aggregation(decoding of the PDCCH of a resource allocation information format afteraggregation), and performs connection setup processing subsequent to theacquisition of broadcast information (BCCH) thereafter (step S105 ofFIG. 14( b)).

In a band in which only the mobile station device 200 having thecapability for aggregation is accommodated, the base station device 100constantly uses the PDCCH of the resource allocation information formatafter the above-described aggregation, regardless of the capability ofthe mobile station device 200. That is, the base station device 100 doesnot need to know the master region Z01 to be accessed by the mobilestation device 200.

FIG. 14( a) shows a frequency region in which the mobile station device200 can perform reception in each step. In steps S101 to S104, themobile station device 200 can receive regional resources necessary toacquire the PBCH arranged in part of the master region Z01. After stepS104, the mobile station device 200 can receive regional resources ofthe master region Z01 and the slave region Z02.

In the first embodiment of the present invention, the radio unit 103 a(also referred to as a signal transmission unit) of the base stationdevice 100 (FIG. 6) transmits a signal including information, whichspecifies at least one slave region Z02 (also referred to as a secondfrequency band) different from the master region Z01 (also referred toas a first frequency band), to the mobile station device 200 with use ofthe master region Z01.

The data extraction unit 207 a (also referred to as an informationacquisition unit) of the mobile station device 200 (FIG. 7) acquiresinformation, which is included in a signal transmitted from the basestation device 100 with use of the master region Z01 and specifies theslave region Z02.

The scheduling unit 204 (also referred to as a frequency bandspecification unit) specifies the slave region Z02 based on informationacquired by the data extraction unit 207 a.

Specifically, the scheduling unit 204 specifies the slave region Z02based on information included in the PBCH transmitted in a predeterminedfrequency bandwidth within the master region Z01. Also, the schedulingunit 204 may specify whether or not to include a specific channel (thePBCH or the like) located within the slave region Z02 based oninformation acquired by the data extraction unit 207 a.

The radio unit 203 a (also referred to as a communication unit)communicates with the base station device 100 by using the master regionZ01 or the slave region Z02.

In the radio communication system according to the first embodiment ofthe present invention, the mobile station device 200 can initiallyaccess the master region Z01 and can acquire information specifying theslave region Z02 from information included in the master region Z01.Consequently, it is not necessary to separately receive informationspecifying the slave region Z02 from the base station device 100. Thus,at the initiation of communication, information to be transmitted fromthe base station device 100 to the mobile station device 200 can bereduced, and communication can be rapidly initiated between the basestation device 100 and the mobile station device 200.

Second Embodiment

Next, a radio communication system according to the second embodiment ofthe present invention will be described. The radio communication systemaccording to the second embodiment includes a base station device 100′and a mobile station device 200′. Since configurations of the basestation device 100′ and the mobile station device 200′ according to thesecond embodiment are the same as those of the base station device 100(FIG. 6) and the mobile station device 200 (FIG. 7) according to thefirst embodiment, description thereof is omitted. Hereinafter, onlyparts of the second embodiment different from the first embodiment willbe described.

FIG. 17( b) is a sequence diagram showing processing of the radiocommunication system according to the second embodiment of the presentinvention.

First, the mobile station device 200′ acquires a downlinksynchronization signal (SCH) of the base station device 100′ by cellselection or reselection processing, and performs downlinksynchronization processing (step S201). At this time, the downlinksynchronization signal (SCH) is arranged in the master region Z01 (seeFIG. 17( a)).

The mobile station device 200′ acquires the PBCH so that manipulation isperformed in the master region Z01 (step S202).

At this time, information regarding the master region Z01 (a systembandwidth (the number of resource blocks) of the master region Z01 orthe like) is acquired from the PBCH (step S203).

Continuous processing is performed so that manipulation is performed inthe master region Z01 (step S204).

The mobile station device 200′ receives the BCCH mapped to the DL-SCH inthe master region Z01 (Step 205).

Since the DL-SCH is transmitted by dynamic resources of the PDSCHdesignated by the PDCCH, resources can be dynamically changed. Ifinformation regarding an aggregation resource region (informationindicating a system bandwidth (the number of resource blocks) of themaster region Z01, information indicating a carrier frequency, a systembandwidth (the number of resource blocks), or the like of the slaveregion Z02 (see FIG. 17( a)), version information of the mobile stationdevice 200′, and/or the like) is acquired by the BCCH, the mobilestation device 200′ adjusts the radio unit to receive up to the slaveregion Z02 (step S206).

As in the first embodiment, information regarding aggregation resourcesincludes information for recognizing a width of a guard band between themaster region Z01 and the slave region Z02 or between a plurality ofsystem bands included in the entire system.

Thereafter, continuous processing is performed so that manipulation isperformed in the aggregation resource region or the master region Z01.That is, the mobile station device 200′ performs decoding of the PDCCHon the assumption of aggregation (decoding of the PDCCH of a resourceallocation information format after aggregation), and performs normalcommunication by performing connection setup processing subsequent tothe acquisition of broadcast information (BCCH) thereafter (step S207).

When a plurality of master regions Z01 are provided in an accommodationband, the base station device 100′ needs to detect the master region Z01of the mobile station device 200′. The PRACH or RACH is used in thedetection of the master region Z01 of the mobile station device 200′.

For example, the base station device 100′ broadcasts informationregarding the aggregation resource region and information indicatingphysical random access resources of the master region Z01 to each mobilestation device 200′. The mobile station device 200′ performs randomaccess using physical random access resources indicated in an accessedregion. Thus, the base station device 100′ can determine what is aregion used by the mobile station device 200′ having the random accessas the master region Z01 from physical random access resources used bythe mobile station device 200′, and can use the PDCCH, under assumptionthat the master region Z01 is specified, in random access processing andsubsequent processing. In the CCCH, the master region Z01 of the mobilestation device 200′ is reported from the mobile station device 200′ tothe base station device 100′ during a random access procedure.

If the mobile station device 200′ having the capability for aggregationand the mobile station device 200′ without the capability foraggregation are accommodated in the accommodation band, the base stationdevice 100′ needs to detect the capability for aggregation of the mobilestation device 200′. The PRACH or RACH is used in the detection of thecapability for aggregation of the mobile station device 200′.

For example, the base station device 100′ broadcasts the informationregarding the aggregation resource region and the information indicatingphysical random access resources for the mobile station device 200′ toeach mobile station device 200′. When the aggregation is used, randomaccess is performed using the physical random access resources for themobile station device 200′ using the aggregation. Thus, the base stationdevice 100′ can determine whether or not the mobile station device 200′having the random access has the capability for aggregation from theused physical random access resources, and can use the PDCCH, underassumption that the aggregation is performed, in random accessprocessing and subsequent processing. In the CCCH, the capability foraggregation of the mobile station device 200′ may be reported from themobile station device 200′ to the base station device 100′ during arandom access procedure. A downlink band used during the random accessprocedure is the master region Z01.

Further, the mobile station device 200′ may perform parallel processingso that manipulation is performed in the master region Z01. A mobilestation device incapable of using the aggregation or a mobile stationdevice incapable of decoding the information regarding the aggregationresource region performs processing so that manipulation is performed inthe master region Z01.

The presence/absence of a specific channel (the downlink synchronizationsignal (SCH), the PBCH, the BCCH, or the like) within the slave regionZ02 is broadcast to each mobile station device 200′ by the master regionZ01. If a plurality of slave regions Z02 exist, the base station device100′ broadcasts the presence/absence of a specific channel of eachregion to the mobile station device 200′. The mobile station device 200′specifies the presence/absence of the specific channel of each regionfrom broadcast information. At this time, it is possible to efficientlyoperate the system without arranging the BCCH in the slave region Z02 byconfiguring the system so that the BCCH mapped to the DL-SCH istransmitted only in the master region Z01.

FIG. 17( a) shows a frequency region capable of being received by themobile station device 200′ in each step. In steps S201 to S203, themobile station device 200′ can receive regional resources necessary toacquire the PBCH arranged in part of the master region Z01. In stepsS203 to S206, the mobile station device 200′ can receive regionalresources of the master region Z01. After step S206, the mobile stationdevice 200′ can receive regional resources of the master region Z01 andthe slave region Z02.

In the second embodiment of the present invention, the radio unit 103 a(also referred to as a signal transmission unit) of the base stationdevice 100′ (FIG. 6) transmits a signal including information, whichspecifies at least one slave region Z02 (also referred to as a secondfrequency band) different from the master region Z01 (also referred toas a first frequency band), to the mobile station device 200′ with useof the master region Z01.

The data extraction unit 207 a (also referred to as an informationacquisition unit) of the mobile station device 200′ (FIG. 7) acquiresinformation, which is included in a signal transmitted from the basestation device 100′ with use of the master region Z01 and specifies theslave region Z02.

The scheduling unit 204 (also referred to as a frequency bandspecification unit) specifies the slave region Z02 based on informationacquired by the data extraction unit 207 a.

Specifically, the scheduling unit 204 specifies the slave region Z02based on broadcast information included in the PDSCH transmitted in apredetermined frequency bandwidth within the master region Z01.

Also, the scheduling unit 204 may specify the slave region Z02 based oncontrol information directed to a specific mobile station device 200′transmitted in the PDSCH within the master region Z01.

The radio unit 203 a (also referred to as a communication unit)communicates with the base station device 100′ by using the masterregion Z01 or the slave region Z02.

In this embodiment, the mobile station device 200′ may acquire downlinkcontrol information, which designates resources within the master regionZ01 and the slave region Z02, from the base station device 100′ afterresources of broadcast information is designated by a downlink controlsignal, which designates resources within the master region Z01, and themaster region Z01 may be specified.

In the radio communication system according to the second embodiment ofthe present invention, the mobile station device 200′ can initiallyaccess the master region Z01 and can acquire information specifying theslave region Z02 from the information included in the master region Z01.Consequently, it is not necessary to separately receive informationspecifying the slave region Z02 from the base station device 100′. Thus,it is possible to reduce information to be transmitted from the basestation device 100′ to the mobile station device 200′ at the initiationof communication, and to rapidly initiate communication between the basestation device 100′ and the mobile station device 200′.

Specifically, since information regarding the aggregation resourceregion is acquired by receiving the BCCH mapped to the DL-SCH, there isan advantageous effect in that resources can be dynamically changed.

Third Embodiment

Next, a radio communication system according to the third embodiment ofthe present invention will be described. The radio communication systemaccording to the third embodiment includes a base station device 100″and a mobile station device 200″. Since configurations of the basestation device 100″ and the mobile station device 200″ according to thesecond embodiment are the same as those of the base station device 100″(FIG. 6) and the mobile station device 200″ (FIG. 7) according to thefirst embodiment, description thereof is omitted. Hereinafter, onlyparts of the third embodiment different from the first embodiment willbe described.

FIG. 18( b) is a sequence diagram showing processing of the radiocommunication system according to the third embodiment of the presentinvention.

First, the mobile station device 200″ acquires a downlinksynchronization signal (SCH) of the base station device 100″ by cellselection or reselection processing, and performs downlinksynchronization processing (step S301). At this time, the downlinksynchronization signal (SCH) is arranged in the master region Z01 (seeFIG. 18( a)).

The mobile station device 200″ acquires the PBCH so that manipulation isperformed in the master region Z01 (step S302). At this time,information regarding the master region Z01 (a system bandwidth (thenumber of resource blocks) of the master region Z01 or the like) isacquired from the PBCH (step S303). Continuous processing is performedso that manipulation is performed in the master region Z01 (step S304).

The mobile station device 200″ performs RRC connection establishmentprocedure by the master region Z01 and establishes a communication state(RRC connection state). In RRC connection setup (the CCCH (RRCsignaling)) during the RRC connection establishment procedure or theDCCH (RRC signaling) directed to the mobile station device 200″ duringcommunication, information regarding an aggregation resource region(information indicating a system bandwidth (the number of resourceblocks) of the master region Z01, information indicating a carrierfrequency, a system bandwidth (the number of resource blocks), or thelike of the slave region Z02 (see FIG. 18( a)), version information ofthe mobile station device 200″, and/or the like) is reported from thebase station device 100″ to the mobile station device 200″ (step S305).

The CCCH or DCCH is mapped to the DL-SCH in the master region Z01. Sincethe DL-SCH is transmitted by dynamic resources of the PDSCH designatedby the PDCCH, resources can be dynamically changed.

The mobile station device 200″ acquiring information regarding anaggregation resource region adjusts the radio unit 203 a (FIG. 7) toreceive up to the slave region Z02 (step S306). Thereafter, continuousprocessing is performed so that manipulation is performed in theaggregation resource region or the aggregation resource region and themaster region Z01.

That is, the mobile station device 200″ performs decoding of the PDCCHon the assumption of aggregation (decoding of the PDCCH of a resourceallocation information format after aggregation) after checking the CCCHor DCCH (RRC signaling) (step S307).

When a plurality of master regions Z01 are provided in an accommodationband, the base station device 100″ needs to detect the master region Z01of the mobile station device 200″. As in the second embodiment, themaster region Z01 of the mobile station device 200″ is detected usingthe PRACH or RACH, or the master region Z01 of the mobile station device200″ is reported from the mobile station device 200″ to the base stationdevice 100″ by the CCCH during a random access procedure.

The master region Z01 of the mobile station device 200″ can bedesignated from the base station device 100″ by the DCCH (RRCsignaling), and can be changed.

If a mobile station device 200″ having the capability for aggregationand a mobile station device 200″ without the capability for aggregationare accommodated in the accommodation band, the base station device 100″needs to detect the capability for aggregation of the mobile stationdevice 200″.

The base station device 100″ uses information from the upper layer inthe detection of the capability for aggregation of the mobile stationdevice 200″. The base station device 100″ determines whether or not themobile station device 200″ having random access has the capability foraggregation. If the base station device 100″ instructs the mobilestation device 200″ to use aggregation resources, the aggregationresources are designated by the DCCH (RRC signaling).

By the CCCH, the capability for aggregation of the mobile station device200″ may be reported from the mobile station device 200″ to the basestation device 100″ during the random access procedure.

Further, the mobile station device 200″ may perform parallel processingso that manipulation is performed in the master region Z01. The mobilestation device 200″, which does not acquire the information regardingthe aggregation resource region, may perform processing so thatmanipulation is performed in the master region Z01.

The presence/absence of a specific channel (the downlink synchronizationsignal (SCH), the PBCH, the BCCH, or the like) within the slave regionZ02 is broadcast by the master region Z01. The presence/absence of thespecific channel within the slave region Z02 is reported from the basestation device 100″ to the mobile station device 200″ by dedicatedcontrol information. The mobile station device 200″ specifies thepresence/absence of a specific channel of each region from broadcastinformation or dedicated control information.

If a plurality of slave regions Z02 exist, the base station device 100″reports the presence/absence of a specific channel of each region to themobile station device 200″. At this time, it is possible to efficientlyoperate the system without arranging the BCCH in the slave region Z02 byconfiguring the system so that the BCCH mapped to the DL-SCH istransmitted only in the master region Z01.

FIG. 18( a) shows a frequency region capable of being received by themobile station device 200″ in each step. In steps S301 to S303, themobile station device 200″ can receive regional resources necessary toacquire the PBCH arranged in part of the master region Z01. In stepsS303 to S306, the mobile station device 200″ can receive regionalresources of the master region Z01. After step S306, the mobile stationdevice 200″ can receive regional resources of the master region Z01 andthe slave region Z02.

In the radio communication system according to the third embodiment ofthe present invention, the mobile station device 200″ can initiallyaccess the master region Z01 and can acquire information specifying theslave region Z02 from the information included in the master region Z01.Consequently, it is not necessary to separately receive informationspecifying the slave region Z02 from the base station device 100″ as inthe first embodiment. Thus, it is possible to reduce information to betransmitted from the base station device 100″ to the mobile stationdevice 200″ at the initiation of communication, and to rapidly initiatecommunication.

Specifically, since information regarding the aggregation resourceregion is acquired by receiving the BCCH mapped to the DL-SCH, there isan advantageous effect in that aggregation resources to each of specificmobile station devices can be changed in application.

In the above-described embodiments, for convenience of description, theexpressions of the capability for aggregation and the informationregarding the aggregation resource region has been used, but theexpressions may respectively indicate versions (a release version, anoperation version, and the like) of the mobile station devices (themobile station devices 200, 200′, and 200″) and information regarding aregion for a new version of mobile station device. That is, the mobilestation device not having the capability for aggregation exists if therelease version of the mobile station device is old, and the capabilityfor aggregation is provided if the release version of the mobile stationdevice is new.

The system configured by aggregating a plurality of system bands hasbeen described in the above-described embodiments, but one system may beconfigured by a plurality of sub system bands. Each system band (or subsystem band) is also called a carrier component. This indicates a regionwhere the system is operated by a specific receiver or transmitterfocusing on a carrier frequency at the center of carrier components.

An example in which the base station devices (the base station devices100, 100′, and 100″) correspond in one-to-one relation to the mobilestation devices (the mobile station devices 200, 200′, and 200″) hasbeen described for convenience of description in the above-describedembodiments, but a plurality of base station devices and mobile stationdevices may be provided. The mobile station device is not limited to amobile terminal, and may be realized by embedding a function of themobile station device in the base station device or a fixed terminal.

In the above-described embodiments, a program for implementing functionswithin the base station device or functions of the mobile station devicemay be recorded on a computer readable recording medium. The basestation device or the mobile station device may be controlled byenabling a computer system to read and execute the program recorded onthe recording medium. The “computer system” used herein includes an OSand hardware, such as peripheral devices.

The “computer readable recording medium” is a portable medium such as aflexible disc, magneto-optical disc, ROM and CD-ROM, and a storagedevice, such as a hard disk, built in the computer system. Furthermore,the “computer readable recording medium” may also include a medium thatdynamically holds a program for a short period of time, such as acommunication line when a program is transmitted via a network such asthe Internet or a communication network such as a telephone network, anda medium that holds a program for a fixed period of time, such as avolatile memory in a computer system serving as a server or client inthe above situation. The program may be one for implementing part of theabove functions, or the above functions may be implemented incombination with a program already recorded on the computer system.

The embodiments of the present invention have been described in detailwith reference to the drawings. However, specific configurations are notlimited to the embodiments and may include any design in the scopewithout departing from the subject matter of the present invention.

INDUSTRIAL APPLICABILITY

The present invention is applicable to a communication system, a mobilestation device, a communication method, and the like that can reduceinformation to be transmitted from a base station device to the mobilestation device at the initiation of communication and that can rapidlyinitiate communication.

REFERENCE SYMBOLS

-   -   100: Base station device    -   101 a, 101 b: Data control unit    -   102 a, 102 b: OFDM modulation unit    -   103 a, 103 b: Radio unit    -   104: Scheduling unit    -   105: Channel estimation unit    -   106: DFT-S-OFDM demodulation unit    -   107: Data extraction unit    -   108: Upper layer    -   200: Mobile station device    -   201: Data control unit    -   202: DFT-S-OFDM modulation unit    -   203 a, 203 b: Radio unit    -   204: Scheduling unit    -   205 a, 205 b: Channel estimation unit    -   206 a, 206 b: OFDM demodulation unit    -   207 a, 207 b: Data extraction unit    -   208: Upper layer    -   301: Physical mapping unit    -   302: Reference signal generation unit    -   303: Synchronization signal generation unit    -   304: Modulation unit    -   305: IFFT unit    -   306: CP insertion unit    -   307: D/A conversion unit    -   308: Radio transmission unit    -   401: Radio reception unit    -   402: A/D conversion unit    -   403: CP removal unit    -   404: FFT unit    -   405: Demodulation unit    -   501: Physical mapping unit    -   502: Reference signal generation unit    -   503: Synchronization signal generation unit    -   504-1, 504-2: Modulation unit    -   505-1, 505-2: IFFT unit    -   506-1, 506-2: CP insertion unit    -   507-1, 507-2: D/A conversion unit    -   508-1, 508-2: Radio transmission unit    -   601-1, 601-2: Radio reception unit    -   602-1, 602-2: A/D conversion unit    -   603-1, 603-2: Band-specific channel estimation unit    -   604-1, 604-2: CP removal unit    -   605-1, 605-2: FFT unit    -   606-1, 606-2: Demodulation unit    -   A1, A2: Antenna unit

1. A mobile station device comprising: an information acquisition unitconfigured to and/or programmed to acquire information, which specifiesa system bandwidth and a carrier frequency of a second downlink carriercomponent different from a first downlink carrier component, transmittedusing RRC signaling via a physical downlink shared channel within thefirst downlink carrier component; and a communication unit configured tocommunicate with the base station device by aggregate use of both thefirst downlink carrier component and the second downlink carriercomponent, wherein the first downlink carrier component and the seconddownlink carrier component have different carrier frequencies and eachof the first downlink carrier component and the second downlink carriercomponent has its own downlink system bandwidth.
 2. The mobile stationdevice according to claim 1, wherein the system bandwidth of the seconddownlink component carrier is represented by the number of resourceblocks.
 3. A base station device comprising: a signal transmission unitconfigured to and/or programmed to transmit a signal includinginformation, which specifies a system bandwidth and a carrier frequencyof second downlink carrier component different from a first downlinkcarrier component, to the mobile station device with use of RRCsignaling via a physical downlink shared channel within the firstdownlink carrier component, wherein the first downlink carrier componentand the second downlink carrier component have different carrierfrequencies and each of the first downlink carrier component and thesecond downlink carrier component has its own downlink system bandwidth;and a communication unit configured to and/or programmed to communicatewith the mobile station device by aggregate use of both the firstdownlink carrier component and the second downlink carrier component. 4.The base station device according to claim 3, wherein the systembandwidth of the second downlink component carrier is represented by thenumber of resource blocks.
 5. A method performed by a mobile stationdevice, the method comprising: acquiring information, which specifies asystem bandwidth and a carrier frequency of second downlink carriercomponent different from a first downlink carrier component, transmittedusing RRC signaling via a physical downlink shared channel within thefirst downlink carrier component; and communicating with the basestation device by aggregate use of both the first downlink carriercomponent and the second downlink carrier component, wherein the firstdownlink carrier component and the second downlink carrier componenthave different carrier frequencies and each of the first downlinkcarrier component and the second downlink carrier component has its owndownlink system bandwidth.
 6. The method according to claim 5, whereinthe system bandwidth of the second downlink component carrier isrepresented by the number of resource blocks.
 7. A method performed by abase station device, the method comprising: transmitting a signalincluding information, which specifies a system bandwidth and a carrierfrequency of second downlink carrier component different from a firstdownlink carrier component, to the mobile station device with use of RRCsignaling via a physical downlink shared channel within the firstdownlink carrier component, wherein the first downlink carrier componentand the second downlink carrier component have different carrierfrequencies and each of the first downlink carrier component and thesecond downlink carrier component has its own downlink system bandwidth;and communicating with the mobile station device by aggregate use ofboth the first downlink carrier component and the second downlinkcarrier component.
 8. The method according to claim 7, wherein thesystem bandwidth of the second downlink component carrier is representedby the number of resource blocks.